Shimano BR-IM31 Service Instructions

Brand: Shimano

Model: BR-IM31

Category: Bicycles

Type: Service Instructions

This manual is also suitable for

BR-IM35-RF

SI-IM31E-001-00

General Safety Information

SI-IM31E-001

BR-IM31-R

BR-IM35-RF

Inter-M Brake

Technical Service Instruction

Installation of the Inter-M brake

After setting the hub onto the frame, install the brake

arm of the Inter-M brake to the chainstay with the brake

arm clip, provisionally tighten the clip screw and clip

nut, and then tighten the brake unit fixing nut.

Note:

If the brake arm is in the incorrect position as shown in

the illustration so that it cannot be provisionally installed

to the chainstay, loosen the brake unit fixing nut and

turn the brake arm. Then, after provisionally securing

the brake arm to the chainstay, tighten the brake unit

fixing nut.

Tightening torque:

20 – 25 N·m {174 – 218 in. lbs.}

Brake arm clip

Brake unit fixing nut

Brake arm

Chainstay

After securing the hub to the frame with the hub nuts,

fix the brake arm of the Inter-M brake securely to the

chainstay with the brake arm clip.

If excessive force is applied to the brake arm, the

wheel will become difficult to turn. Make sure that

you don’t apply excessive force when installing.

Brake arm clip

Brake arm

Chainstay

Note:

When installing the brake arm clip, securely tighten

●

the clip screw while holding the clip nut with a 10 mm

spanner.

Tightening torque:

2 – 3 N·m {17 – 26 in. lbs.}

After installing the brake arm clip, check that the clip

●

screw protrudes about 4 mm from the surface of the

clip nut.

About 4 mm

Brake arm clip

Clip nut

Clip screw

(M6 × 16mm)

Brake arm

Installing the brake cable

Place the cable adjusting bolt so that it is 15 – 17 mm

from the end of the brake arm, and then pass the inner

cable through the cable adjusting bolt of the brake arm

and then through the hole in the inner cable fixing bolt.

Brake arm

Cable adjusting bolt

Hole in the inner

cable fixing bolt

Should be

15 – 17 mm

Check that both ends of the outer casing are securely

inserted into the cable adjusting bolts of both the brake

lever and brake arm.

Both ends of the

outer casing should

be securely inserted.

Cable adjusting bolt

Pull the link back until it stops. Then, while pulling the

inner cable to apply the full amount of tension to the

cable, tighten the inner cable fixing nut.

Tightening torque:

6 – 8 N·m {52 – 70 in. lbs.}

Pull

Pull strongly

Tighten

Link

Inner cable fixing nut

Note:

Set the inner cable so

that it passes below the

link.

Adjusting the brake cable

After checking that the wheel does not easily turn while

the brake cable is being pulled, depress the brake lever

about 10 times as far as the grip in order to run in the

brake cable.

Depress about

10 times

Note:

If the brake cable is not run in, it will need to be

adjusted again after only a short period of use.

Turn the cable adjusting bolt so that there is about 15

mm of play in the brake lever.

The amount of brake lever play is the distance from

the position where the brake lever is not operated to

the position where a force is felt suddenly when the

brake lever is pulled.

15 mm of play

Cable adjusting bolt

After depressing the brake lever to check the braking

performance, secure the cable adjusting bolt with the

cable adjusting nut.

Cable adjusting nut

Tightening torque:

1 – 2 N·m

{9 – 17 in. lbs.}

WARNING

– To avoid serious injuries:

It is important to completely understand the

●

operation of your bicycle’s brake system. Improper

use of your bicycle’s brake system may result

in a loss of control or an accident, which could

lead to severe injury. Because each bicycle may

handle differently, be sure to learn the proper

braking technique (including brake lever pressure

and bicycle control characteristics) and operation

of your bicycle. This can be done by consulting

your professional bicycle dealer and the bicycle’s

owners manual, and by practicing your riding and

braking technique.

When securing the brake arm to the frame, be sure

●

to securely tighten the clip screw and clip nut to the

specified tightening torque.

Use lock nuts with nylon inserts (self-locking nuts)

for the clip nut. It is recommended that standard

Shimano parts be used for the clip screw, clip nut

and brake arm clip.

If the clip nut comes off the brake arm, or if the clip

screw or brake arm clip becomes damaged, the

brake arm may rotate on the chainstay and cause

the handlebars to jerk suddenly, or the bicycle

wheel may lock and the bicycle may fall over,

causing serious injury.

Obtain and read the service instructions

●

carefully prior to installing the parts. Loose,

worn, or damaged parts may cause serious injury

to the rider.

We strongly recommend only using genuine

Shimano replacement parts.

Read these Technical Service Instructions

●

carefully, and keep them in a safe place for later

reference.

CAUTION

– To avoid serious injuries:

The Shimano Inter-M brake system cannot be used

with mountain bikes. If you try to use it with mountain

bikes, hard braking operation will cause the internal

brake parts to become very hot, and this may weaken

braking performance. It may also cause a reduction

in the amount of brake grease inside the brake, and

this can lead to problems such as abnormally sudden

braking.

If any of the following occur while using the brakes,

stop riding immediately and ask the place of purchase

to carry out inspection and repairs.

1) If abnormal noise is heard when the brakes are

applied

2) If braking force is abnormally strong

3) If braking force is abnormally weak

In the case of 1) and 2), the cause might be not

enough brake grease, so ask the place of purchase

to grease the mechanism with special roller brake

grease.

In order to get the best performance from the

Shimano Inter-M brake, be sure to use Shimano

brakes cables and brake levers as a set.

The amount of movement of the inner cable

must be 14.5 mm or more when the brake lever

is depressed. If it is less than 14.5 mm, braking

performance will suffer, and the brakes may fail

to work.

Check that the brake arm is securely fastened to the

chainstay by the brake arm clip. If it is not installed

correctly, braking performance will suffer.

If excessive force is

applied to the brake

arm, the wheel will

become difficult to

turn. Make sure

that you don’t apply

excessive force when

installing.

Brake arm clip

Chainstay

Brake arm

If the brakes are used frequently,

the area around the brake may

become hot.

Do not touch the area around the

brake for at least 30 minutes after

you finish riding the bicycle.

If the brake cable becomes rusted, braking

performance will suffer. If this happens, replace the

brake cable with a genuine Shimano brake cable and

re-check the braking performance.

The brake unit should never be disassembled. If it is

disassembled, it will no longer work properly.

NOTE:

The Inter-M brake is different from conventional

●

brakes in that the inside of the brake drum is filled with

grease. This may cause the turning of the wheel to be

slightly heavier than usual, particularly in cold weather.

For maximum performance we highly recommend

●

Shimano lubricants and maintenance products.

For any questions regarding methods of handling or

●

adjustment, please contact the place of purchase.

Area around

the brake

These service instructions explain how to use and maintain

the Shimano bicycle parts which have been used on your new

bicycle. For any questions regarding your bicycle or other matters

which are not related to Shimano parts‚ please contact the place

of purchase or the bicycle manufacturer.

* Service Instructions in further languages are available at:

http://techdocs.shimano.com

Please note: Specifications are subject to change for improvement

without notice. (English)

-77

i-k

Osa

590

Japa

Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222

One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003

SHIMANO AMERICAN CORPORATION

SHIMANO EUROPE B.V.

SHIMANO INC.

Shimano BR-IM31 Service Instructions

Brand: Shimano

Model: BR-IM31

Category: Bicycles

Type: Service Instructions

This manual is also suitable for

BR-IM35-RF

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Shimano BR-IM31 Service Instructions

This manual is also suitable for

Shimano BR-IM31 Service Instructions

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